Nitrogen filled tires & tires for sale spam

[Mark Holden]

Tim Rogers wrote:
> Err, almost.
> Water vapor is usually still a vapor when its in your tires but it has a
> much higher coefficient of expansion (meaning that for every degree of
> temperature increase, it expands more than either N2 or O2) so it is
> almost
> exclusively responsible for the pressure change as the tire heats up.

Very true.  I oversimplified it because people always complain that
PV=nRT so water vapor should expand at the same rate as any other gas,
when of course, (P+a(n/V)^2)(V/n-b)=RT.

All clear now, right?

:)